Improvement in emery-wheel clamp



lnid game lEDWARD A. SWERKROP, OF WASHINGTON, DISTRICT OF COLUMBIA.

Letters Patent No. 101,058, dated March 22, 1870.

IMPROVEMENT IN EMERY-WHEEL CLAMP.

The Schedule referred to in these Letters Patent and making part ofthe same To all whom lit lmay concern:

Be it known that I, EDWARD A. SwnmrRoP, of the city and county of l/Vashington, and District of Columbia, have invented a certain new and useful Emery-Wheel Cla-mp.

My invention consists iu forming upon the inner surface of the clamps an outwardly-projectiug rim, of a size in diameter equal to the diameter of the eyes of the emery-wheel, and also in having in the center of theclamps eyes fitted to receive the arbor on which they are to operate; and I do hereby declare that the following specification, taken in connection with the drawings furnished and forming a part of the same, is,`

a true, clear, a'ud exact description thereof.

Reference being had to the drawings- Figure l represents in side View the inner and outer face ofa pair of my clamps. They are vboth provided, as usual, with arbor-holes. A is a projecting ring cast upon the inner face of the clamp, and its Iouter diameter is equal to the diameter ofthe eye of the emery-wheel with which it is to be used.

Figure 2 represents a composition emery-wheel.

Figure 3 represents in section the' mode of application of my improved clamp to the wheel.

In the manufacture of solid or composition emerywheels, it is desirable to make them with a large eye, in order that a greater portion ofthe material may be applied to the circumference, for the wheel, as it becomes worn to a smaller diameter, becomes less effective as a grinding device.

Heretofore clamps have generally been Imade with a straight inner face. Upon partially compressing a wheel between such a pair, it became necessary to center the wheel by pressure against its periphery. Some little time was always requisite to effect this centering.

As the diameters of the eyes of the various sizes of wheels are generally about the same, the circumference of the ring A may be turned to a certain size, according to the kind of wheels in use. Much time is saved in centering, for it cannot well be out of ccnter when placed on the rings.

Another advantage is obvious. vWith the old style of clamps, when the emery-wheel was worn thin, or near the eye, they were liable to break inward from pressure of the article being ground. With my improved clamp, the emery may be worn to the .mcrelst shell, as the ring backs it up, or sustains it against springing and breaking.

My clamp is especially adapted for use with the articleknown as the tannite emery-wheel.

I am well aware that saw-gummers have been constructed having two clamps, with an inwardly-proiecting ring similaitomy present invention. Such, however, were securely fastened together after the emerywheel or grindstone had been adjusted, and to remove the same special manipulation or unscrewing of the parts was essential. They were also constructed with an arbor-eye in but one clamp, while in the other a central annular portion was removed to allow of its passing over, but not in contact with the arbor-collar, and the one clamp is secured upon the arbor between its collars.

Having thus described my invention,

I claim as new and desire to secure by Letters Patent- The improved emery-wheel clamp herein described, consisting of a right and left-hand collar, each of which is provided with the inwardly-projecting ring, A, and suitable arbor-eyes, substantially as shown and described.

E. A. SUiVERKROP.

Witnesses:

WM.- B. Woon,

PHIL.- F. LARNER. 

